I just came across this morning to some additional information from the
regulator (CNE) regarding their motivations on its Arcos TPA ruling:

1) Despite the current regulatory gaps, Enron's allegations were properly
crafted, and made possible a way forward within the existing legal framework.
The "two-sides commitment" idea suggested by Enron has been quite determinant
because...

2) ... the resolution fundamentally aims at making sure that the power plant
is actually built (Enron finally commits), but also that new gas
infrastructures start being developed asap!! There is clearly an underlying
energy policy issue here, and this reasoning fits with the tight timescales
imposed by the CNE to ratify our interest and signing the TPA contract. The
resolution is seen by the CNE as a catalyser to put in track gas expansions
and power plant investments.

Note that the CNE (and the Ministry) are testing if Enron is "truly"
committed to put the money and invest by placing us in a no-return point
(mine).

Please, find below a full English translation of the CNE's ruling.

Of special interest, see sections III, VI, VII and IX of the GROUNDS FOR THE
DECISION ADOPTED Chapter.

a.